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"There is an old joke, widely told among economists, about an economist strolling down the street with a companion when they come upon a 100 dollar bill lying on the ground. As the companion reaches down to pick it up, the economist says ‘Don’t bother — if it were a real 100 dollar bill, someone would have already picked it up’.”

A quant(financial engineer), a mechanical engineer, and a chemical engineer are shipwrecked on a deserted island. They are starving, and are tired of eating coconuts. They come upon a can of food on the beach....

The mechanical engineer says, 'let's wdge the can between these 2 palm trees and rig a branch to chop the top of the can off' The other two quickly point out that this will destroy the can and likely send the contents all over the place, wasting them...

The chemical engineer says, 'let's take the sea water and reverse the polarity of the water extracting the salt to make an acid and then burn one end of the can off' The other two quickly point out that while this is clever it will likely ruin the contents of the can.

The quant says, 'let's make a simplifying modeling assumption.... let's begin by assuming that we have a can opener'

A researcher, a risk manager and a trader each bring a dog to a competition.

The first one to display is the researcher's dog. The researcher brought a bottle of milk a bowl and placed it all on the floor. Then he commanded the dog to take the bottle and pour the milk into the bowl until the maximum amount it could hold. And that is exactly what his dog did.

The second one to display is the risk manager's dog. The risk manager's brought a bottle of milk a bowl and placed it all on the floor. Then he commanded the dog to take the bottle and pour the milk into the bowl until two thirds of the maximum it could hold and without spilling any milk during the whole process. And that is exactly what his dog did.

The third one to display is the trader's dog. The trader did not bring anything other than the dog. Then he commanded the dog to do what he taught. The dog stands up and walks in the direction of each one of the bowls and drinks all the milk.

Two Day-Traders went to go eat (after the market closed of course!). One of the traders orders a steak and has a hard time cutting it. He then asks for a sharper knife... when he unfolds his cutlery the knife hits his plate and falls out of the table and lands right by his foot which was slightly sticking out of the table. The other trader looks at him and says "Why didn't you move your foot when the knife was falling?!" to which he responded, "I thought it was going back up!".